Download Android source code

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Http://blog.chinaunix.net/uid-25033252-id-3641350.html

This article is based on ubuntu10.10.

1. Because we need an android simulator, We need to install the android SDK and create an AVD,

You can name it avd15, avd22, avd23 ,...

Avd15 corresponds to 1.5, avd22 corresponds to 2.2, and avd23 corresponds to 2.3 ,...

Get the. config file:

Start the simulator avd15:

$ Emulator-AVD avd15

$ Pull/proc/config.gz. // copy the/proc/config.gz file to a local directory, corresponding to the current working directory on Linux, the same below

Decompress the package and save it as. config for later use.

 

2 arm Compiler

Download the arm tool chain from the website

Note that when selecting an earlier version, it is very likely that the Google team chose the latest version at the time of compilation, but it was always used later.

Http://www.codesourcery.com/sgpp/lite/arm/portal/subscription? @ Template = Lite

Previous versions: Click All versions to view all release versions. The 2008q3-41 version is available for use by many tests.

After decompression, set the environment variable to add/usr/local/arm-2008q3/bin to $ path

/Usr/local/is the root directory of the unzipped arm-tools-chain.

 

3. Download the android Linux Kernel

Remember that it is the android Linux kernel (GIT clone git: // android.git.kernel.org/kernel/common.git), rather than the general linuxe kernel source code (GIT clone git: // android.git.kernel.org/kernel/linux-2.6.git)

$ Git clone git: // android.git.kernel.org/kernel/common.git kernel-common

// The kernel-common directory stores the code from the code library, the same below

This step is a long wait...

$ Cd ~ /Kernel-common

$ Git Branch

$ Android 2.6.36

// The version changes.

 

4. After downloading the android Linux kernel source code, you will find that there is no goldfish_defconfig file under/ARCH/ARM/configs/. Well, we need the check_out gold_fish version (the hardware configuration of the simulator is gold_fish)

$ Cd ~ /Kernel_common

$ Git branch-

$ * Android-2.6.36

Remotes/ORIGIN/head-> origin/Android-2.6.36

Remotes/ORIGIN/Android-2.6.35

Remotes/ORIGIN/Android-2.6.36

Remotes/ORIGIN/archive/Android-2.6.25.

Remotes/ORIGIN/archive/Android-2.6.27.

Remotes/ORIGIN/archive/Android-2.6.29.

Remotes/ORIGIN/archive/Android-2.6.32.

Remotes/ORIGIN/archive/android-gldfish-2.6.29

Remotes/ORIGIN/archive/Android-goldfsh-2.6.27

// The above information is currently displayed. It may be a bit different in the future, and even the branch name of the old version will be modified.

// Pay special attention to this

$ Git checkout remotes/ORIGIN/archive/android-gldfish-2.6.29

Git checkout remotes/ORIGIN/Android-goldfish-3.4

// This process is much faster, waiting for the data to be downloaded.

// Git is really not easy to use. I miss tortoisesvn on Windows.

After downloading, you can see the file goldfish_defconfig under kernel-Common/ARCH/ARM/configs /.

5. Compile

1) copy the. config file in 1 ~ /Kernel_common directory

2) Modify ~ /Makefile under the kernel_common directory (modify two places) -- it is best to back up this file if you modify this file and use git to get the new version.

The MAKEFILE file is modified.

Arch? = Arm // set the CPU architecture to arm

Cross_compile? = Arm-None-Linux-gnueabi-// arm compilation tool prefix

3)

$ Make goldfish_defconfig

$ Make-J2 // The current machine is dual-core, so that code compilation is faster.

Compile the last two lines of information:

Objcopy ARCH/ARM/boot/zimage

Kernel: ARCH/ARM/boot/zimage is ready

6. Start the simulator with the kernel we just compiled (this will not affect the original simulator)

$ Emulator-AVD avd15-kernel ~ /Kernel_common/ARCH/ARM/boot/zimage

If the simulator can be up, it means it is successful.

Open another terminal, so that the terminal can be used when the above terminal is occupied.

$ ADB Shell

# Cd/proc

# Cat version

Linux version 2.6.29-00262-gb0d93fb-dirty (dream @ dream-VGN-FW351J) (GCC version 4.3.2 (sourcery g ++ lite 2008q3-41) #1 Fri Dec 24 12:31:28 CST 2010

# Cat cupinfo

Cupinfo: no such file or directory

# Cat cpuinfo

Processor: ARM926EJ-S Rev 5 (v5l)

Bogomips: 272.79

Features: SWP half thumb fastmult vfp edsp Java

CPU Implementer: 0x41

CPU architecture: 5tej

CPU variant: 0x0

CPU part: 0x926

CPU revision: 5

 

Hardware: goldfish

Revision: 0000

Serial: 0000000000000000

 

Note: dream @ dream-VGN-FW351J, where dream is the user name currently logged on to Ubuntu, And the dream-VGN-FW351J is the machine name

Sourcery g ++ lite 2008q3-41. This is the arm tools chain version.

 

References:

1. Android kernel Compilation Method

2. Download and compile Android Kernel

3. Android kernel Compilation Method

4. Specify branch in Git-clone

5. http://android.git.kernel.org/

# Android